* [https://docs.microsoft.com/en-us/powershell/wmf Windows Management Framework] for your Operating System which includes the PowerShell

+

* [https://docs.microsoft.com/en-us/powershell/wmf Windows Management Framework] for your Operating System which includes the PowerShell

Please take note of the system requirements and further notices for the respective version of the Windows Management Framework.

Please take note of the system requirements and further notices for the respective version of the Windows Management Framework.

Revision as of 12:57, 15 January 2018

Important notice: The PowerShell API wrapper for the MailStore Server Administration API provided on this website is to be regarded as an example implementation of an API client. This wrapper should help system administrators and developers to quickly understand how MailStore Server Administration API calls work and how to use them in their own scripts.
Please understand that beyond this documentation no further support for the Powershell API wrapper is provided. Unless stated otherwise, the PowerShell API wrapper as well as all related example scripts are released under the terms and conditions of the MIT License.

This tutorial aims to explain the usage of the Administration API through simple Windows PowerShell example scripts. Basic knowledge of MailStore Server, Windows and PowerShell is a necessary precondition. In order to prevent loss of data, service interruption or other problems, it is highly recommended to use a non-productive test environment for this tutorial as well as for script development in general. The 30-day-trial version of MailStore Server is perfectly suited for this.

Installation of Necessary Components

The examples demonstrated here use the MailStore PowerShell API Wrapper and are compatible with Windows PowerShell 3.0 and higher. Depending on your version of Windows it might be necessary to download and install a compatible version of PowerShell first. You can find the components necessary for this tutorial here:

Please take note of the system requirements and further notices for the respective version of the Windows Management Framework.

Important Notice: Installation of a Windows Management Framework on systems that require a specific version of Windows PowerShell, such as Microsoft Exchange Servers, is not supported and may lead to massive system failures and data loss.

Neither the MailStore PowerShell API Wrapper nor the example scripts are digitally signed, therefore execution of such scripts has to be enabled in an administrative PowerShell session using

Set-ExecutionPolicy-ExecutionPolicyUnrestricted

Importing the MailStore PowerShell API Wrapper

The MailStore PowerShell API Wrapper is implemented as a PowerShell Script Module (MS.PS.Lib.psm1) and can thus be imported in a PowerShell session via its manifest (MS.PS.Lib.psd1) by using Import-Module.

Please open a PowerShell session and import the API wrapper module using this command:

Getting Information about the MailStore PowerShell API Wrapper

The MailStore PowerShell API Wrapper provides several functions and variables to access the MailStore Server Administration API, following PowerShell conventions. Enter the following command to get information about these features:

Get-ModuleMS.PS.Lib|fl

More detailed information is available through the module's properties. For example,

(Get-ModuleMS.PS.Lib).ExportedFunctions

returns the functions provided by the module. Via

Get-Help*MSApi*

the MailStore PowerShell API Wrapper returns inline help for all its functions.

Calling API Wrapper Functions

The following example script (Example1.ps1 in the tutorial package) explains the basic usage of MailStore PowerShell API Wrapper functions.

The function New-MSApiClient creates a new API client object, which is used by the Invoke-MSApiCall function for API calls. The values for -Username, -Password, -MailStoreServer and -Port used in the script are the function's defaults, only the switch -IgnoreInvalidSSLCerts has to be set if untrusted certificates are used; otherwise an error occurs.

Apart from the API client object, Invoke-MSApiCall needs an API command and its parameters if applicable. The command GetServerInfo in the script does not have any parameters and returns a JSON object as follows:

Providing Parameters

For most MailStore Server Administration API commands you need to provide parameters. Of course, the MailStore PowerShell API Wrapper's Invoke-MSApiCall function can submit these parameters, as demonstrated by the following script (Example2.ps1 in the tutorial package):

The scripts lists details about the users created in MailStore Server. Because the MailStore PowerShell API Wrapper converts MailStore Server Management API responses into objects, their properties can be used directly in the script's workflow.

As can be seen in the privilegesOnFolders property, returned objects may be nested and may also contain further objects.

Handling Asynchronous API Calls

The server may decide to execute Administration API commands asynchronously if their execution takes more time. The MailStore PowerShell API Wrapper can either wait for such asynchronously executed API commands to complete or run them as PowerShell Jobs in the background.

Waiting for Asynchronous API Calls to Complete

A script's execution can be interrupted until a PowerShell Job created by the API wrapper terminates as demonstrated by the following script (Example3.ps1 in the tutorial package):

By using Invoke-MSApiCall the API wrapper waits for an API command that is executed asynchronously by MailStore Server to complete and simply returns its final result.

Subscribing to Events Triggered by Asynchronous API Calls

Instead of interrupting a script's execution, the PowerShell Jobs created by the API wrapper can be reacted to while they are running in the background. These jobs trigger a PowerShell EngineEvent with each status request that the script can subscribe to in order to execute further code on each occurrence. To demonstrate this, the previous script needs to be adapted only a bit (Example4.ps1 in the tutorial package):

By using Start-MSApiCall the API wrapper runs an API command that is executed asynchronously by MailStore Server in the background and returns its first result. The script subscribes to the event that is triggered by the background job via Register-EngineEvent, using the return object's Token property as SourceIdentifier. By that property the event relates to the triggering PowerShell Job and thus to the server process. The Action script block is itself created as a PowerShell Job that is executed with each triggering of the event. Through the MessageData property of the $eventautomatic variable the script block can access the return object provided by the background job. That object contains the status of the server process: